Chapter 2 More controls

Group Box grp• Used as containers for other controls such as radio buttons and check – What is displayed on the top edge of the group box Group Group... Check Box chk• Used for user in

Chapter 2

More Controls

Programming In

C Shap

Controls in the Toolbox

3 Text Box (txt)

• Used for user input/data entry

– What is displayed in text box

– What user entered in text box

4 Group Box (grp)

• Used as containers for

other controls such as

radio buttons and check

– What is displayed on the

top edge of the group box Group Group

5 Check Box (chk)

• Used for user input/data entry

• Allows the user to select or

deselect 1 or more in any group

• Checked Property (stores current

state of the Check Box)

– Checked = True

– Unchecked = False

• CheckChanged Event

– Occurs when user clicks on one of

the Check Boxes

Check box

6 Radio Button (rad)

• Used for user input/data entry

• Allows the user to select only 1 in any group

• First create a group and then create each

radio button inside the group

• Checked Property (stores current state of

the Radio Button)

• Checked = True

– Unchecked = False

• CheckChanged Event

– Occurs when user clicks on one of the

7 Picture Box (pic)

– StretchImage causes graphic to

be resized to match the size of

the control

7 Form (frm) Đặc biệt chứa các

control khác

Common Properties Description

Enter is pressed.

Escape key is pressed.

none, single, dimensional).

three-7 Form (frm) Đặc biệt chứa các

control khác (cont)

Common Methods Description

Close() Closes a Form and releases all

resources, such as the memory used for the Form's controls and

components A closed Form cannot be reopened

Show() Displays a hidden Form

Hide() Hides a Form, but does not destroy the

Form or release its resources

7 Form (frm) Đặc biệt chứa các control khác (cont)

displayed in the Visual Studio editor when you double click the Form in the Visual Studio

designer.

Selecting Multiple Controls

• SHIFT-Click or CTRL-Click to

select/deselect multiple controls

• Use the mouse to drag a selection box

around multiple controls

• To deselect all selected controls click

elsewhere on the form

Selecting Multiple Controls

Start

here

Drag

to here

What Can be Done with

Multiple Selected Controls?

• Use Format Menu or Layout Toolbar to

– Align them to each other

• Move them as a group

• Set their common properties

Designing the User Interface

• To the user the Interface should be

– Sans Serif Fonts are best, not boldface or large

Keyboard Access Keys

• Also referred to as Hot Keys

• Underlined Letter

• User presses ALT + underlined letter

• Use Windows-Standard Keys

• Defined using Text Property

Text=&OK Text=E&xit

Default & Cancel Buttons

– Responds to ESC key

– Form's CancelButton Property

Focus

• Not all control types can receive the focus

• TabStop Property (applicable only for controls that are capable of receiving the focus- labels and pictures can’t)

– Designates whether a control is allowed to

receive the focus; True or False

Tab Order

focus through a form in an organized manner; top

to bottom, left to right

• TabStop property (yes is the defaualt)

– Number in tab sequence

– 0 for first control to receive the focus when the form

loads

Setting TabIndex Property

• View menu, TabOrder

• Click on each control in sequence to set

TabIndex property of controls automatically

Form's Screen Location

• Small label that is displayed when user places

pointer on a control and pauses

• Usually used with Command Buttons

• Steps for creating ToolTips

– Add a ToolTip Control to Form

• Appears in the Component Tray, pane at bottom of Form

Designer where nondisplay controls are shown

– Set ToolTip on ToolTip1 Property of each control to

the text of tip

txtName.Text = ""

lblMessage.Text = ""

txtCourse.Clear( )

Clearing Text Boxes & Labels

– Empty String is 2 quotation marks with no space

between them ("")

txtName.Focus( )

Resetting the Focus

• Places the Insertion Point in a Text Box

• Use the Focus Method

radRed.Checked = True chkBold.Checked = False

Checked Property of Check Boxes and Radio Buttons

• Selects/Deselects Check Box or Radio

Button

• Set Checked Property

C# Color Constants

Class

keyword Color followed by a period

txtName.ForeColor = Color.AliceBlue lblMessage.BackColor = Color.White

lblFullName.Text = txtFName.Text + " " & txtLName.Text lblNote.Text = "Today's w eather is " + txtWeather.Text & "."

Concatenation

• Think of it as "glueing" text strings together

• Example: txtFName contains First Name

txtLName contains Last Name

private void radgreen_CheckedChanged(object sender, EventArgs e)

{ lblDDang.ForeColor = Color.Green; }

Ví Dụ 2 LightSwitcher

picMo picTat

lblhuongdan